Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Bass Boost, Wahwah, and Noise Removal, and it also supports VST plug-in effects.

All Effect Menu items (built-in or plugin) can now be used in a Chain.

Items in the Effect, Generate or Analyze Menus can be sorted or grouped by name, publisher or class of effect.

Noise Removal is improved and renamed to "Noise Reduction".

Change Speed has new time controls for current and new length. You can now enter the speed change as a multiplier e.g. "2" is twice as fast.

New "Crossfade Tracks" effect can be used for crossfading two tracks. This replaces Cross Fade In and Cross Fade Out.

Nyquist Prompt and most shipped Nyquist effects now have Preview button.

Interface:

Redesigned Meter Toolbars: The default shows separate Record and Playback Meters, half-height so they can be wider while docked, in gradient style.

A frequency selection can now be made (and spectral edit effects applied to those frequencies) when in a spectrogram view. You can also create or adjust frequency selections in a new "Spectral Selection Toolbar" (available at View > Toolbars).

Transcription Toolbar (Play-at-speed) can now loop play and cut-preview.

Timer Record now saves recordings automatically into an existing project.

(Windows) Recording with WASAPI host now includes experimental support for physical inputs (up to 24-bit depth) as well as loopback recording.

(OS X) 10.10 (Yosemite) is now supported including Apple Audio Units.

(Linux Ubuntu) Under Unity, keyboard shortcuts are not visible in the Audacity menus. Keyboard shortcuts are visible if you install the classic GNOME Flashback interface or under Unity if you open Audacity with the UBUNTU_MENUPROXY=0 environment variable. Audacity compiled from source will ship with src/audacity.desktop.in set to UBUNTU_MENUPROXY=0 but it will remain up to distributions to use this desktop file.

Bug Fixes

Interface:

Typing "j" or "k" in a label track activated the "move cursor" shortcut.